can monther and son have same blood group - Page 2

Speaking as a scientist, an o blood group in a child is possible in three ways. 1. One or both parents have O blood type. 2. Both parents have A or B blood groups. 3. One parent has A blood type and the other parent has B blood type. Possibilities 2 and 3 are very rare. Genetically speaking though, both mother and son can have o- blood type. And so it makes sense for all three (Ketki Masi, Ambaji, and Aditya) to have the same blood group. 

i think its not necessary that both of them have a same blood group.

y nt it cn be my sis nd my mom share same blood grp

My mom and bro are both o + and dad and me are A+

Yes.. Myself and my son hv the same blood group.

.most of my cousin sisters hv their mum's blood group .. it is highly possible that child gets blood group of either mother or father