You can get two small kids and cargo in a 911 no problem.
An M3 is a $70k version of a $35k car. A Porsche 911 most def isn't.
Get an Audi RS4. That's a four door, four seat version of a $120k car (R8) for $70k.
Hey, each to their own. All good cars. Whatever works for you and makes you feel good.