I am sorry for the delay responding but I was away at the weekend.
My daughter [Claire also} was a widow with two children. A son 23 brought up by her sister and a daughter 14 removed from her care aged 10 and being raised by her paternal grandparents.Neither child was her husbands.
Her son refuses to have anything to do with his birth mother alive or dead.
I hope this doesn`t complicate things further
That will not be a problem.