Right around 12 months, both my kids loved putting things into and taking things out of containers. This bug jar was their favorite: Melissa & Doug Bug Jug Fill & Spill https://smile.amazon.com/dp/B000NV6BZY/ref=cm_sw_r_cp_api_i_dEmFFbH3BF7PS

In my experience, grandparents usually like to see kids immediately using gifts. 8 months is probably too early to use the bug jar itself, but the bug toys are great for playing and chewing, and they make different quiet sounds (rattle, crinkle, etc.).

Oh, and stacking cups! There are all sorts of fancy ones, but both my kids loved these cheap ones: The First Years Stack Up Cup Toys https://smile.amazon.com/dp/B00005C5H4/ref=cm_sw_r_cp_api_i_3HmFFb4GSYH1Z