Can he give his zakah to his mother through breastfeeding?

Praise be to Allah.

Yes, the mother and sister through breastfeeding may be given zakah if they are entitled to zakah, because the mother and sister through breastfeeding are not people on whom one is obliged to spend, so they may be given zakah, so long as it is proven that they are entitled to it. End quote. 

And Allah knows best.