can I file for my mom and my 16 year old daughter ?

Yes that is possible. Are your mother and daughter overseas? If so, you can file for both and they would process as immediate relatives at the US consulate in their country of residence. If they are currently in the US and they entered legally, they can adjust status to obtain their green cards. Counsel anywhere in the USA can represent you and some of us charge a very affordable flat fee and stay in the case until the end.