Sadaqa can be given to your needy relatives except those whose financial responsibility is on you like your parents, your wife, and our children.
Main thing is insuring her safety and security. She must be sure that she is fully able to protect herself and keep her respect and modesty as a Muslim female who performs Hijab and all religious duties. She should never take risk of living far away from her family when there is possibility of any harm on her her.
Ther are many Du'a s and advices from the Prophet (SAWA) and Ahlul Bayt (AS) to increase financial Rizq e.g.
1- ALLAHUMMA INNI AS'ALOKA MIN FADHLIKA AL-'ADHEEM KHAIRAL DUNIA WAL AAKHIRA اللهم اني أسألك من فضلك العظيم خير الدنيا والآخرة and also INNA HATHA LA RIZQUNA MA LAHU MIN NAFAAD ان هذا لرزقنا ما له من نفاد
2. Reciting Sura Al-Waqi'ah every night.
3. Repeating Isteghfaar استغفر الله and Salawaat اللهم صل على محمد وآل محمد
4. Reciting Azan at home with loud voice.
5. Giving Sadaqa every morning and every evening.
6. Being busy in worshiping Allah between Fajr and sunshine.
7. Praying for other believers who are in need but not in front of them.
8. Visiting the graves of your parents and seeking from Allah near their graves.
9. Being with Wudhu as long as you can especially before meals and before going to bed.
10. Reciting Sura Yaseen every day in the morning or any time.
11. Ziyarat Ashura every day.
12. Namaz e Shabb (Night Prayer) صلاة الليل
These are few useful things for increasing the Rizq and there are many more in our books.
It is not permissible to spend any amount which was earned from Haraam source on family or friends. Such money must be given back to the real owner or if unknown or unreachable then to be spent on poor people through the Marje of Taqleed.
It is very important to have good relationship with your relatives but that should never make you disobey Allah in sitting with females who improperly dressed or wearing makeup. We must avoid such gatherings until the participants make proper sitting arrangement for men and women with out mixing.
Yes you are obliged to always be keep good relation with them because they are your family from which Allah (SWT) Has created you. Stopping speaking with them will never help you but will increase your problems as well as make you a sinner. Those who cut ties or have bad dealings with their relatives are cursed by Allah in Quran.
If a man was to conduct a secret marriage with another Muslim woman without telling his wife, that nikah he did is considered valid, although it is not advisable in any way, for the many ramifications it will have.
A spousal relationship is based on trust, transparency, commitment and loyalty.
With prayers for your success.
First if all you should have concrete evidence against that person before accusing him of doing black magic, then another concrete evidence that he is doing it against your father. Before have such concrete evidence against that person, you might fall in a major sin of putting allegation on that person.
You have no right to tell any one about what you think about that person before having the concrete evidence against him.
As far as the black magic which you think is done against your father and his family, the remedy is the same whether it was really done by any one or not. Even if it was not done, it is useful to protect your family by the same recitations which are: Sura Al-Falaq and Sura A-Naas to be recited after every prayer and before going to bed three times, as well as Ayatul Kursi. Sadaqa is also very useful in protection from evil.
We must refrain from any sinful act even if family and friends insist in it. You must refuse any sinful act. No one is more important to obey more than Allah (SWT). We disobey every one but never disobey Allah (SWT).
Different people look at a thing and take different lessons from it.
However, one could glean from their marriage that when two people are sincere, mutually self-sacrificing, pool their wealth and talents, and committed to each other and a higher cause, they can accomplish anything!
I am sure there will be some other insights as well.
Read what the Prophet (SAWA) and his Progeny (AS) said about treating your family (Best of you are those who are the best in treating their families).
You need also to read about the bad results of being toxic to your family e.g. miserable situation in the grave, etc.
'We need to be humble inside our hearts and believe that our family members are humans like us and part of us. We deal Wi them as we want them to deal with us. We will enjoy life here and hereafter if we treat others nicely especially our family.
Try to look at the mirror if you become angry, you should calm down because you will see how ugly to be angry.
Keep on seeking forgiveness for the past and seeking help of Allah to make you a nice person with your family.
We should tolerate such relative who is bad to us and be always kind to him as much as we can. We should not behave badly with relatives who misbehave with us. The Hadeeth from the Prophet (SAWA) orders us to do good to all our relatives including and most importantly to those who are bad to us.