How cute! The childhood friend pair eventually got married and had a son with more to come but it looks like the son is interested in a girl slightly older than him just like his dad.
描き下ろし告白 (高校生のふたりが付き合うまで)
This is an omake about a confession in highschool.
(かきおろし kakioroshi, actually, but omake is more widely known. It just means it was a special illustration exclusive to the volume).
You're gonna make me cry by, instead of translating “描き下ろし” as “newly drawn artwork”, just using “omake”, which itself is another piece of untranslation that should be translated as “bonus” 😭😭😭,
Anyways, that suggests to me that volume 2 does not have the Pregnancy and Family Arc.... but that doesn't mean they didn't fit it in somewhere. It's only 8 pages long.