I am a female-aries/horse and he is a pisces/pig, explain our union?

we also have a 6 yr. old son together who is a virgo/rooster and have been living/together for 8 years. Also he has 2 daughters (not mine) one is a pisces/horse and the other is pisces/tiger, then i have older son (not his)who is a scorpio/snake, how does this all fit in and how do we work together, i mean i get the horse-horse and the horse-tiger but the rest. help.