Fun ways to tell the kids your pregnant

C

So I have 2 bio kids and a step daughter who we have this weekend all together and while step daughter was with us wanted to tell the kids all together that we are expecting a baby in July. Was thinking of going a bit of a goodie box for each of them with a picture of the scan, a white onesie each that they can paint/draw on and decorate for brother or sister (we are keeping gender a suprise) and maybe finding a downloadable card saying congrats on becoming big brother/sisters. Just wondering if anyone else have done a bit of a goodie box to announce and what you added into it as well as any photos of what you did would be amazing :) kids current ages are 7,4,3. We are keeping this baby very much to ourselves and won't announce untill birth so wanting to make this announcement to the kids quite big and special as it will be our only "big" announcement