So my dad and mum are divorced and I live with my mum. My brother is 15 , I'm 13 and my little sister is 11 ( they live with my mum also ). I think my mum seems a little lonely cause we all go off to school for the day and there is no one at home after she has finished work ( we have after-school activities every day ) I think having a baby/toddler around would be perfect! So is there any tips on what I could do to convince my mum to foster?

Can a single person be a foster parent in your State or Country?

I think three children ages 11 to 15 plus working is rather overwhelming. I don't know when she would have time for another child.

No, there are no tips to persuade someone else to take in a foster child. Wait a few years until you're an adult, finished with your education, married - and then you can become a foster parent.

Most likely she is adjusting to being single. And often a baby is the last thing she needs. And she most likely just sits around after work relaxing after she cooks, cleans house, does laundry, pays the bills, and all of that fun stuff parents do.

Perhaps in a little time a boyfriend is more what she needs than a baby.