If you have looked after your dog properly and socialised him as you should have done, he will be more than able to understand that he has an extended family who he can trust and love.
Our beloved dog knew exactly who was part of his family, including my adult children their partners, grandchildren, sister etc. He was entirely happy to spend time with any of them, in fact got exited. Not sure what that meant for our parenting😧.
In fact we are discussing another puppy, nothing decided yet, but it is almost definite that he will outlive us, so socialising with family will be vital, (both adult children are nagging us to get another dog and willing to take him on in the event of our demise)
It is a massive decision, but one thing for sure if we decide to share our home with another dog it won’t be euthanised on our demise.