Mr B on guard

I had a family of 6 Blackbirds in the garden today.Comprising 4 males and 2 females? So someone is going to be out of luck come the Spring.
   To be honest I think they are all from one clutch.So they will disperse when Spring arrives.And they will all find new partners?
   They are looking very healthy at the moment so next year should be another good season for the local colony?