Should we move in with my dad?

I have been dating my current boyfriend (Harry) for 8 months. He is 28 and I am 26.

Harry and I have basically lived together for the past few months and we've decided to get our own apartment this summer. There is one catch. My dad lives in the area and he is a widower. My mom passed away almost 10 years ago. Dad is a great guy and gets along well with Harry. Anyway, my dad suggested that Harry and I move in with him instead of getting our own place so we could save some money. This might sound like a strange idea, but my dad works a LOT so he really isn't home that much, his house is very big, and he isn't overprotective at all.

At first I said no way; we don't absolutely need to save money. But I've been thinking about it more lately and I'm starting to believe that my dad wants us to move in because his is lonely. He has lived by himself for two years and before that just with my younger sister, who is now in college. So I now really feel like I should move in with him -- not because I feel obligated to, but because he has always been great to me and I really don't want him living all by himself. I honestly feel like this is something I have to do.

I explained this to Harry and was a little surprised by how against this idea he was, especially since he is always so easy going about everything. The reason he gave me was that it "would look weird" for him to be living with my dad. And while I agree that in 99% of cases it would, this is a different situation. I've asked a bunch of friends and the opinion is pretty mixed as to whether I would be expecting too much of Harry to ask him to do this. I've come to realize that if this is so important to Harry, I should really respect his feelings about this.

I don't want to hurt Harry but at this point I feel like the most important thing is for me to be there for my dad. I am not at all thinking about ending things with Harry, but I need to figure out a way to do what I feel like I need to do (be there for my dad) while continuing to have Harry in my life. I don't believe that living in our own apartment and seeing my dad on the weekends is enough. I know that even if I did live with my dad we wouldn't see each other much during the week, but it would still be significantly more than otherwise, especially since I work most weekends. I also think that it would just make my dad feel better to know that someone else is living in the house.

What would you suggest?

– Good Daughter or Good Girlfriend?, Boston