travel system help !!

hey mommas i need alil help. i have my first sons old car seat not expired yet. but its a graco classic connect and i need to upgrade my stroller to either a double or a sit and stand as my first born is almost 2 and baby #2 is due about a month after his birthday. problem is all i can find is click connects. is it gonna work with my classic connect seat  or should i just look for a new system ?