AITA for refusing to tell my dad about my son's paternity?

I (27F) am a single mom to my 7 month old son. I have 2 other sons, aged 5 and 3, and they all have the same big blue eyes and same dimples, and everyone always comments on how much they look like me since I have big blue eyes and dimples too.<br><br>My husband passed away 2 years ago, and I met my new partner last year. We got serious really quickly, and I got pregnant after 3 months of dating. That's why my baby has big brown eyes instead of blue, since my new partner has brown eyes.<br><br>My dad is very close to all of my sons, and he also loves my new partner, but he made some comments about how glad he is that my baby got sent to us before my husband passed, because he's "my husband's last gift and memory for us to keep".<br><br>I don't want to tell him the truth about the baby's paternity because I know he'd feel bad, and I want him to have that comfort. My new partner is ok with it too, and my baby's birth certificate lists him as the father (which is legal where I live).<br><br>But my dad keeps trying to get me to say that my husband was the last thing that made our family complete before he left us. He's not trying to be mean, and if you knew him you'd agree. I just want him to keep the peace and comfort he has, and I also feel weird talking about my new relationship with him.<br><br>I told him multiple times that I'm not used to talking about the baby's father or my feelings about him because I'm still getting there. He told me that he understands and said he'll drop it, but I can see in his eyes that he's still not satisfied with that answer. He's a very expressive person, and I can tell what he's thinking by looking at his face.<br><br>I asked my mom if I should stop this, but she said I should tell him, out of respect for my new partner.