Q.What is this plant?
My son gave me this 3 years ago and it’s gotten so big now. It sits in a room with lots of sun. I don’t do anything special other than a weekly watering. The pot it’s in doesn’t drain. Should I place in a different planter?

Certified GKH Gardening Expert
It looks like a type of Kalanchoe, possibly 'Blossfeldiana,' or flaming Katy. Yours is rather tall, so you can pinch it back to keep it shorter and bushier.
They are succulents, so I would put it in a pot with drainage holes. Here is more information on their care:
https://www.gardeningknowhow.com/houseplants/kalanchoe/growing-flaming-katy.htm