I'm gonna make this short and simple since no parent or sibling wants to read a long note so

Girls:

LED lights

Fairy lights

Sandals (something comfortable for the summer)

Acrylic nails (something short or medium length, you can get online or go to a nail salon

Candle (a sweet scent)

Hoodies

Stickers (whatever they're into

Bucket hats

Nike socks

Body scrubs

Tote bag

PJ set

Boys:

Hoodies

A watch

Goofy socks

Nike's and Jordan's

Nike socks

Hats

A new game controller

A gamer headset

Traffic cones

Sweatpants

PJ pants

A basketball hoop for their door

Dumbbells

Slides

Monopoly

Both: gift cards