My husband and I facing the same situation, where our topics are revolving around the children. However, so far we find this is okay as both of us like the topics regarding kids.
We have weekly night dating without kids on Friday night and during the date we try to talk more about our past, his work and future dreams (e.g. career, new house) instead of only about kids' stuff.
I have friends who have short couple trip every month to spark the relationship. Perhaps you can try this too, just both of you and your husband to spend quality time together.
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