"Thanks." It was for Sirius' encouragement and belief in Remus that he was thanking him for, but it also included giving him advice in the first place. Since they first started talking, Sirius had been easy to open up to. "I think, or at least I hope, she already likes me just a little. I may win her over with guns." It was funny to him, thinking of it that way, but if it worked, and it made her feel better to have something back that she enjoyed, then that was enough.
"Triplets. Wow." One baby, one kid, was a lot of work - but three? At the same time? That sounded almost horrifying. And Sirius didn't even stop there. "That sounds like...a lot." A lot to help shape him into the person he became. Every experience aided in that and every detail was just another piece of the puzzle.