I've read the replies and I just want to put my two cents in. For starters, the only reason kids aren't allowed in the front is because of airbags. Since the car is an older model, you don't need to worry about that. And, no it's not illegal to put your kid in a two seater.
I'm going to cover a basic area in vehicle size: Yes, larger vehicles are (technically) safer than smaller ones. Due to their size they are designed to hold up better in an accident because the manueverability isn't there to avoid an accident. Smaller vehicles (especially sportier models) are made to avoid accidents (the steering is tighter, the car is quicker to respond to the driver).
I love my truck. I drive it everwhere. However, when we purchased a car for my teen son to drive, we bought a coupe (two-door). I hated it when we bought it, but after driving it, there are times I feel safer with that car (and it's an older model with no airbag and no anti-lock).
For instance, I like that the car is smaller within it's lane on the road. There is one curvy road near my house. One side is a drop off and the other is, well on-coming traffic. People are always dipping their tires over the yellow line. With my truck, I don't have extra room in my lane. With the car, I can hug the white line and have plenty of distance from the yellow-line dippers. And the steering is quick to respond.
Yes, there are idiots on the road, no we cannot protect ourselves 24/7. I was beserk about road protection when my teen started driving. At some point, we have to trust ourselves in our abilities and accept that we cannot control out-lying factors. Let me tell you, that's hard to accept with a teen driver (GULP!).
And yes, I've been in my fair share of accidents. In vehicles of all sizes. Mainly in my teens and my friends were driving.
However, if you don't feel comfortable with the car, I suggest speaking with your husband and letting him know you don't think the car is as safe as you would like. Or, compromise. Some days when I'm running errands (especially if I have to go to the post office or the mall where parking is tight) I'll let my son know I will be using his car and he can use the truck. Maybe, you could work out some arrangement with your husband. The days you have many errands to run, let him know you'll be using the family car.