I know what you are going through, nobody in my family signs and growing up I never really bonded with any of them. I was lucky because I could hear pretty good on one ear, but I never felt I was fully included in my immediate family's social circle. Although, I have a much better relationship with them today.
The fact is, you can't force people to learn sign for you. You need to use all tools available to communicate with people from lip reading to relay services and, yes, sign as well for those who use it.
Your kids are, after all children and they can't be expected to understand your needs as you are an adult. You should have them learn sign, but I would be careful of going voice off with them because others have tried it and it has not worked well in some cases. Just as in the real world, you need to use all means possible to communicate with your family.
We all go through this isolation to some degree or other. For the most part, the better your communication skills the less isolation you experience.