How do I find out the domain name registration and web hosting for my husband's two websites?

My late husband maintained two websites. I have my personal email through one of them and the one I use for all transactions through the other.

Any updates, billings, renewals, etc., would be coming to him through e-mail on his computer. I have no idea how to get to it.

How do I find out? If I can’t figure out what’s due when and how to pay for it, I’m going to lose all my connections and email history, as well as everything he has stored and posted on those pages, including some pictures and other family stuff.

Where do I start?

I need JP.