"Sissers" is a slang term and it's not used in standard French.
Depending on the context, you could consider using:
* "Sœurs" (pronounced "sœʁ") for "sisters"
* "Mes sœurs" (pronounced "me sœʁ") for "my sisters"
* "Les sœurs" (pronounced "le sœʁ") for "the sisters"
* "Frères et sœurs" (pronounced "frɛʁ e sœʁ") for "brothers and sisters"
It's important to remember that slang terms can have different meanings and connotations depending on the region and context.
If you can provide more information about the context in which you want to use the term "sissers," I might be able to offer a more accurate translation.