Were these rescues?
I'm asking because you don't know what the little things have been through, and sometimes it takes longer to break them of bad habits in these cases.
I've got a male terrier/Chi mix I rescued over 2 years ago, and we're still trying to bring some semblance of normalcy to his life. I was the only person in the world that he was not terrified of when we got him. He warmed up to my daughter first - but I think it was because she reminded him so much of me - same voice, same tone, same laid back attitude. It took 6 months before he stopped biting my husband daily - he acted out his fear with aggression - he was abused, and expected everyone to abuse him. After 2 years, he finally decided my big tattooed son was okay and stopped biting him.
Patience is the best advice I can give you. These little dogs deserve it, and you'll reap the rewards a hundred times over.
If they are urinating out of fear, I don't think the neuter will stop this. You will have to resolve their fear and teach them to trust you. Then it will stop. But neutering will stop them from marking their territory usually.