Please I need help I'm so confused

[Philbeth]

My mother was born in London and so she's a British citizen. she came to Nigeria when her daddy died, she was 3 year's old wen he died. She grew up and got married in Nigeria. I'm her first child I have 3 siblings and our dad died in 2012. Please i want to know the significance of my mom being a British citizen. How can we her children be made citizens too. My other siblings are below 18 years of age. My mummy want to go back to London but she doesn't know how to go about it. And she wants us to come with her so that we can have better chances at life. Please what do we do? Thank you.

[CR001]

What year was she born?

What year were each of the kids born?

Were her parents British citizens by birth?