$1.$ My family is small and there are three people: my parents and me.

→ S + to be + Adj/ Adv (My family is small)

There are + danh từ đếm được số nhiều + O: dùng để giới thiệu rằng có cái gì/ai đó ở đâu trong hiện tại. (there are three people: my parents and me.)

$2.$ My father and my mother are workers and they work hard in the factory.

→ S + to be + O (My father and my mother are workers)

Thì hiện tại đơn: S + Vs/es + O (They work hard in the factory.)