Does one fulfill the mitzva of Mishloach Manos if it’s given to one’s father, brother, nephew etc.? Or should it be given to a non-relative?
It is permitted to send mishloach manos to a relative, and one is yotza with that. Some authorities (Eshel Avrohom (Butchatch) 695-4) question if a father can be yotza with sending to his small children who he supports, and to his older children if he is sending them something that he would otherwise have to give them to eat.
There are even an opinion (Mekadesh Yisroel 242) that a husband can send to his wife!
Livushei Mordichai O:CH 2-9 (3), Yismach Yisroel 23-6.