DS3, 16 months - very insistent and clear that it has to be me at night only. If DH tries to settle him, he gets increasingly distraught almost as if he is frightened. If we are both there, he waves at DH and says "Night night" (which means he wants him to go away) he may also say "No" and point at the door.
He will immediately calm down if I appear and settles with me.
The only thing DH can do if DS is unsettled at night is fully wake him up and take him to another room to play. Obviously, that's not what we want him to do at night!
I am breastfeeding, and aware this might obviously play in but it's not something that I want to stop yet. I am considering night weaning over the next few months but it's not something that I am likely to rush into. My other children were also breastfeeding at night at this age, but were able to be settled by other people, even though they preferred me, they didn't have such an extreme reaction. Nobody else has ever looked after DS3 (pandemic baby).
DH is very involved and TBH, often the favourite in the day - he will look to DH for comfort if he's hurt, ask him for help, want to sit on his lap when tired etc. It's literally just between the hours of 7pm to 7am 