Well, a good thing to get your Dad is a framed picture of you two together, or a picture of the entire family. Another is a collage of pictures of you having fun and of good memories together.
You should make pictures frames out of bottlecaps and a college of you over the years
Buy a Gift Card
Whatever they like. Moms are easy, get them something you made yourself, get dad a nice mug that says something like "#1 DAD", and for your little sister, get her candy or arts & crafts stuff! Merry Christmas!
You can say "I love you, dad. Thank you for all you do for me. Happy Christmas. Love, (your name).
thumbprints
you should get all your family members together and celebrate
If you know how to knit or sew, you could make your dad a scarf or gloves. You could also make him a photo collage of family photos or frame a photo of the two of you. You might also make him a nice card.
For his dad, u could get him books...i know some guys like to read and for his mom, i honestly have no idea sorry
Cake would be nice.
You can make him something instead of wasting your money on something he might don't want.
make it all year!
tell your dad but make sure he wont tell your mom