Mel B's younger sister Danielle Brown has revealed the pair have not spoken in two years and she follows her sister on twitter to check how she is.
Mel B hasn't spoken to her sister in over two years.
The former Spice Girls singer - who lives in Los Angeles with husband Stephen Belafonte and her daughters, Phoenix, 11, and three-year-old Angel from previous relationships - hasn't been in touch with any of her UK-based family and friends, according to her younger sibling Danielle Brown, who follows her on twitter to see how she is.
Danielle - who has children Mimi, three, and five-month-old Hendrix with fiance George Lee - said: "I'm so sick of pretending everything's OK. I don't even know if she's aware I've recently had a baby. Mel hasn't spoken to any of her family or friends in the UK for over two years.
"I don't have her number, I don't know where she lives - I wouldn't know how to get in touch with her. I follow her on twitter to make sure she's OK."
Danielle - who still keeps in touch with her sister's former bandmate Emma Bunton - revealed the pair fell out because she doesn't like Mel's husband Stephen but hopes they can put their differences behind them because she misses her nieces.
She told Britain's OK! magazine: "I hope I will speak to Melanie again because she's my only sister. I miss her and my nieces ridiculously. It hurts."