Both parents have Bi blood type. what blood types could their children have

If both parents have the same blood type then their children would also have the same just like if they have the same eye or hair color

B or O

Explanation:

Two parents with B blood type can be either B or O blood type. One parent with A and another with B can produce a child with A, B, AB or O blood types. If one parent has A and another has AB, they can either produce a child with A, B or AB blood types.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.