Just found a stray family living behind my garage. What to do?

As the title says, I was outside earlier with my dog and heard her getting hissed at. Turns out at least 1 mother and possibly at least 2 kittens are there. I do not want to leave them there as i dont want my dog getting hurt or vice versa. I also have my own cat (indoor) so I dont know if me taking them in is an option either. Is the best thing just to leave them there? Thanks in advance.