Good on you. We were 'one and done'. Two sounds more than 100% more difficult, if only just because the number of edges in the relationship graph going up.

My parents managed four kids, albeit for most of that time there were only 3 living in the home at a time (13 years between the oldest and youngest).

A friend of mine had eleven (!!!) siblings. That horrifies me. Cliques could form in that size population! Utter craziness.