Hi Stephen here (first time - as Julia normally posts x)
What you have is classic - I - feed; walk; run; play; clean-up; and manage all our dogs on a daily basis - and am considered Alpha Male within the whole "pack".
I'm the "Pied-Piper" with the girls, they love me - but just given respect by the boys, they know I have an authority but don't understand me when I'm being "playful" as opposed to doing what I do on a daily basis.
The girls would love anyone and play with anyone who gave them attention - Boys can be slightly different, they can develop a "bond" with an individual within the household, and normally with the Beta female (Wife) - so - basically if I get up to put the kettle on then I return to a settee full of boys in my place !! - if Julia gets up, they then go and check the kitchen where she is, before coming back and settling with me.
You were asking "anyone got any ideas on what to do ?" I'm wondering if your fiancee wants a different type of relationship with Bailey (?) as in my experience males do get along without the same level of communication that women tend to enjoy. So 'who' has the need to 'do' anything?
This is purely a 'blokes eye view' , Stephen x