A Minnesota lawyer says there could be another heir to Prince’s multimillion-dollar estate.

In documents filed on Friday, Michael Padden says a man who’s been widely described as Prince’s half brother, Duane Nelson, had a son, who in turn had a child. Nelson and his son have died, but Padden says the child could be an heir.

Padden says he tried to reach the child’s mother, but was unsuccessful. He asked the court to appoint a guardian to represent the child if the mother doesn’t obtain a lawyer soon. It is being reported that the missing heir is a great-niece, most likely in her teens.

Prince died on April 21 aged 57.

At least one man claims to be Prince’s son, but without confirmation - and unless a will turns up - Prince’s sister and half-siblings are first in line to inherit his estate.

Prince’s sister, meanwhile, has spoken out to silence reports suggesting the Purple Rain star’s family is squabbling over his estate.

Tyka Nelson, who helped comfort fans outside her brother’s Paisley Park home in Minnesota in the hours after his death, insists there is no bad blood between herself and her siblings as they attempt to divide the late star’s assets, contrary to reports they’re all bickering over who should get what in the absence of a will.

Tyka, who filed legal documents to appoint a special administrator to the music icon’s estate, took to Facebook on Friday to update fans and assured them that she and her half-brothers “remain united” as they continue to mourn the loss of Prince.

“To my knowledge... No One in my family has fought about anything, and least of all me... but I must admit I think it’s funny that I’m the one they say, ‘Stormed out...’ or that ‘We are at war’ Me? Us? Really? Where was I when all that happened?”

Her remarks follow stories that suggest she left a family meeting following her brother’s death, clearly unhappy with plans for his estate.