What are the rights of the person asking for the divorce when it comes to the marital assets accrued over time?

Hello, Anonymous. Probably not. Assuming the boat is marital property (which it likely is, but I can't say with any confidence without more information), then they both have equal rights and access to the boat. As long as your father isn't doing anything wasteful with it that would damage its value or waste marital resources (i.e. money) needlessly, then he can likely use it as he sees fit. So can your mother if she wants to. Again, this is assuming it is truly marital property. It doesn't matter who filed for divorce and who is the one responding. Illinois is a no-fault state, and the courts are not concerned with who did what and who caused the divorce. The rights are fundamentally the same. I hope this helps.