Is it possible for both silver molly to have a young that looks like dalmation?

I bought a silver female pregnant molly in a 15 gallon with other 50 silver mollies in a store.(that's why I don't want to give my mollies in LPS )When I came back home I put it in my 5 gallon tank first then it's fry comeout its like 24 fry 4 got eaten by my swordtail and black molly then we put them in a tapperware after that we bought 10 gallon tank then we bought a male silver molly then after a few months the male silver molly died with the goldust and others....only 2 swordtail and the female silver molly survive.Then the other day we found the female silver molly died her body is curved like a circle I don't know what happen then christmas came we bought the 15 gallon tank then we put the silver molly young in the 5 gallon after a couple of months we put them in the main tank with the danios and the other fishes then 5 of them didnt survive while there 15 the two ones got stuck in the net we never notice it we found it is dry in the net.Then when we put the 13 silver mollies in the 15 gallon main tank we saw one of them have black spots...so does dalmation molly come from silver molly mutation?????????!!!!!

 

Um its difficult to read without paragraphs so I'm not sure what happened in your tank but there's no guarantee that she was not impregnated by a Dalmatian molly in early as they can store the sperm for 6+ months. Without knowing what genes are recessive or dominate I couldn't guess

 

there's non dalmation molly in the 15 gallon store tank when we bought her???

 

Um then I'm going to go with. Yes but that's just a guess

 

/That was real hard to read.
You put the female silver molly in a 5 gallon tank(too small), with a sword tail(tank also way too small) and a black molly(again tank too small). She had babies and was probably shortly there after pregnant again from the black molly OR the swordtail. You then purchased a 10 gallon(too small but better) and more mollies, your mollies began dying(lack of cycle, wrong water condition, the best guess at this stage). which they would start doing as they outgrew the tank anyway. This is where I sorta get lost, you bought a 15 gallon, put them in the 5 gallon and put 13 of them in the 15 gallon(overstocked with the mollies once they become juveniles) after a couple months.
Or at least that is what I think you said.
Yes, silver mollies and the dalmatian are a genetic color variation created in the mixing of the black molly and sail fin mollies. You will also see yellow spots on a dalmatian quite frequently.
Couple questions,
Who is in the 5 gallon?
What is in the 10 gallon?
I don't know is at third base.

 

I bought the silver molly while pregnant in 15 gallon tank in lps with 50 same species with her so that's means she got pregnant with a silver molly not a black molly then when she release her fry one of the fry looks like a dalmation molly after a couple of months it still looks like a dalmation molly??????

 

As I said, they are genetically from the same source and you just got a one showing the dalmatian color.