In any form of business. it is always great if couples support each other. It is not limited on Bitcoin alone, I have seen many investments and businesses that prosper because couples support each other.
being a married couple and planning on starting a new family can be hard, it is full of hurdles and problems that involve money, especially when they are having kids. That being said, as long as both of them can afford to invest and understand the risk they are taking by investing in Bitcoin, then I think this could be a good idea and could benefit them in the long run.
But with someone beside you in planning, it is much easier than planning alone. Besides, the lack of insight and funds is the major reason planning for a good future is hard. But if you have the knowledge or wisdom and the fund, planning won't be that hard because:
1. You know what to do
2. You have the fund to pursue what you wanted to do
3. You have a partner that will support you all through out your business/investment venture.
So I agree with @OP, it is best to engage in Bitcoin if our partners approve and support our actions.