Chrysame's Susie has good genetics. As young adults her children look very fine.
A few morbid notes about killing Sims.
You can easily get a Sim to start to drown if you've had them exercise to fatigued. If they swim while fatigued, they will start drowning. But if they haven't left the edge of the pool, they'll just climb right out. So you have to get them away from the edge of the pool, which isn't easy when they notice they are drowning.
You can cause a fire very easily by placing a rug in front of a fireplace. It's quite reliable. Don't bother trying to kill by fire a brave or daredevil Sim. They'll extinguish it before it gets big enough to be dangerous. Getting them to catch fire takes a bit of luck but
It takes 24 hours for a very hungry Sim to start starving. It's 24 hours after that before they die. You really have to be stone hearted or hate the Sim to do that.
All the guys tended the toddlers and babies without prompting. Even before they engaged or married Susie (which several did) and all the toddlers, not just their own.