Who was Anuruddha's father?

In the Pali commentaries, there is a contradiction regarding the name of Thera Anuruddha's father. Somewhere he is said to be the son of Sukkodana, and somewhere of Amitodana. Both Sukkodana and Amitodana were Suddhodana's brother. So, in any case, Anuruddha was surely a cousin of the future Buddha. But his relation with Thera Ananda becomes controversial. Everywhere Ananda is said to be the son of Amitodana. So he might be either a cousin or a brother of Anuruddha. Most modern Western scholars seem to prefer the latter alternative albeit insisting that they were probably step-brothers from different mothers "as the texts do not refer to the two as brothers and imply that they grew up in different households." If that is the case, why not accept Anuruddha as the son of Sukkodana? Are there more weightage in the claim of Amitodana? Can someone answer with commentarial references?