Small or Large families?

I usually play families of 4-5 Sims. Once I start playing more than five, the gameplay becomes too difficult to maintain everyone's needs and skills... and I often end up rushing things just to get stuff out of the way (which makes me feel terrible later on, which results in me wanting to just redo everything).

The only time my household goes over the maximum of 5 is if I have a pet... or one of my Sims' children get married (I usually have their boyfriend/girlfriend move into the house, get them engaged, have a wedding, and sometimes have at least one child before they move out on their own).