@Phad088 we have a 6.5 month old cocker. Lovely nature but also loves a whine. You do need to change your trainer because they can be trained out of that whining but it requires everyone to be on board and everyone doing the same thing. The trainer told us it is a cocker tendency as they can be quite vocal - not barking vocal but 'talking'. Ours makes a noise like out of that Charley the Cat public information ads (if you are old enough to remember that). He still does whine but it is getting better but he is very vocal.
he has serious FOMO. Still at his age, if he hears anyone get up, he's up (during the day). He wants to be at the centre of everything but we've got used to that now.
if it's a lot of whining, it is worth checking with the vet to make sure it's not physical/pain (cockers/cockerpoos often get problems with their ears)
do you have any of the dog toys where they have to figure things out and solve puzzles?
I would also make sure that your dp/kids do more with the dog and take yourself out of the equation if you're finding it stressful.