I have plenty of family as is
Your parents may just worry that you’ll be lonely if you don’t have kids. They’ve enjoyed a life surrounded by family members – holidays filled with visitors and love – and they want you to have the same. They don’t want to envision you being 60, spending Christmas by yourself. You can remind them why that very much won’t be the case. You may have siblings. They’ll have kids. Their kids will get married and have kids. You have cousins who have kids, and their kids will have kids. The family is definitely still growing around you, and you will not have a lonely life.