1. Should I tell my father any of this?: I think in order to do that, you would need to land on a good reason why. If, for example, your mom has gone AWOL and your dad is struggling to understand her absence, that could be a case where clarity is ultimately better than confusion. But if your dad is blissfully unaware of what’s happening right now, and happy and comfortable in his home life, you might decide to let things be. With limited time left, there’s not much he can do with the information besides ache from it. Maybe the most loving option is to protect his peace.