Yes an No. You can have blood type AB in following situations: AO+ BO AA+BB AB+AB So there's more possible ways to get type AB other than the combination of ABs.
AB+
you can - blood to a + but not + to a - o- is the universal blood donor because of this concept. so no.
You can receive an AB unit with matching Rh phenotype, if you are AB Rh negativeThe unit should be negative for all transfusion transmissible diseases
The father would be either AB or AA.