Mine are age 9 and 11. They’ve been calling my fiancé daddy since they were little.
I left their birth father when the youngest was 4 weeks old and moved 200 miles away.
He visited once or twice a year for the first 2 years, staying for a week or more at a time.
Visits would only coincide with eBay items he wanted to collect nearby to me, or when his PC was broke and he wanted to use mine.
He wasn’t really interested in the kids. It was food, lodging, facilities. I always paid his entire fuel costs both ways.
He stopped all visits when I stopped paying his fuel cost, or allowing him to stay with us.
He never contacted the kids by phone, letter, anything. Never asked after them. He’s never financially provided for them, he said, ‘it’s the taxpayers job to pay for them now’ (because I left him and became a single parent).
I started dating someone new in 2012. By then the kids were baby and toddler age.
One started calling him daddy and I just let it flow. The other followed suit shortly after.
We have been living together a few years now and about to be married. The kids have been calling him daddy for several years now.
The youngest doesn’t remember his birth dad, the eldest does, but they’ve been witness to DV in their early days,
and he’s had police remove him in front of the kids when he tried to turn up at my partner’s home, so although theyre aware they have a birth dad (eldest does, youngest kind of denies it as he’s so bonded with my fiancé. Well, not deny, just won’t acknowledge), they never talk about him.
Myself, I lived with a stepdad from 18 months old, and my mother and he went on to have further kids. But I’ve never considered him stepdad or the sibs as step sibs, he’s just always been dad, even though my birth dad was on the scene (in as much as he’d visit on birthdays once a year).
So, because their birth dad is totally absent, I think it’s fine for them to call my fiancé daddy, especially as they’re conscious they have a birth father out there they can differentiate between the two.
Little kids will do want they feel comfortable doing. Fiancé is their dad in every way possible otherwise, and how they address him or perceive him is up to them.