The sibling you found already with a profile, probably had an existing mother that was different from the mother you already had for Albert. The system had to do something about that, and made a choice. Don't know its algorithm for making such a choice.
In any case, find and cite the source for the correct mother, and fix it. The profile for Albert, his wife and his parents are wide open; you do not need to be on the Trusted List to edit it. That said, you should post a message on the profile saying what happened and how you're trying to fix it.