2 robo/robrovski dwarf hamsters?

i have 1 dwarf hamster and i want 2 i am trying to convince my mom that the other 2 that we had were syrian hamsters and they fight not dwarf hamsters she is so stubburn its like if 1 person out of the the whole world disagrees the answer is no! but every time no mater what one person is always going to disagree thats what gets me so mad she doesn't understand that dwarf hamsters should have a playmate and that there is such a slim chance of them fighting or even play fighting please the answers you put here i will be showing them to my mom so be convincing and add if you are an expert on hamsters or if your in hamster rehab or a breeder but only if you really are one and please convince her that budd [my hamster] will be happier and it will improve his health or whatever!