The word 'mother' means something, it has a purpose and that purpose is sex based. This has been upheld by court.
A male should not be gaslighting their children to declare themselves a 'mother' when they are not female. This is cruel to children. The term is not about the male in this instance, it is about the child and the child's needs. How anyone can support this degree of indoctrination into ideological thinking for a child is rather remarkable.
That male could have chosen any neutral or male term for parent. Instead they have chosen not to do that and to lie to their child/children. This is not respectful at all.