How can I make multiple sims in the same family?

[James]

I have the Sims 2 Double Deluxe, and when I create a Sim, it just looks for a house to buy, so I move in, and it's just one Sim! I've looked everywhere, and I don't see a button to add another Sim into that family
I have the Sims 2 Double Deluxe, and when I create a Sim, it just looks for a house to buy, so I move in, and it's just one Sim! But I want to make an actual FAMILY like a Mom a Dad and a child.
I've looked everywhere, and I don't see a button to add another Sim into that family