I understand the Hijab for men and women around non-Mahrams, but is there a type of Hijab around Mahrams as well excluding the spouse? If so, what is that Hijab and why do we need it around them?
Yes, the obligatory dress in front of Mahram like real father, brother, real uncles must cover the parts of the body which if left uncovered can cause bad feelings or bad effect. Although full Hijab is not obligatory in front of Mahram close relatives ( mentioned above) but modest dress is obligatory.
Wassalam.