Samantha Ronson wants to get a restraining order against Lindsay Lohan.
The DJ sent her mother and sister to a Beverly Hills police station April 6 to obtain a legal injunction to keep her former girlfriend away.
A police spokesman confirmed Samantha's family had visited the police station, but refused to say if the inquiry was related to Lindsay, adding: "The Ronsons were directed to the court to get a restraining order."
The "Mean Girls" actress and Samantha, 31, ended their troubled relationship last week but Lindsay is reportedly unwilling to move on.
She allegedly tried to crash a party held for Samantha's sister Charlotte at Bar Marmont in Hollywood on April 3 and was furious when she was refused entry.
She then wrote a series of postings on Twitter accusing Samantha of infidelity and drug addiction.
One post said: "You broke my heart. Now go away. I loved you."
Samantha has reportedly vowed she will never take the 22-year-old actress back, changing the locks on her house and promising her family the turbulent relationship is over for good.
A friend said: "Samantha's family has made her swear that it's really over. They are giving her all the support they can to keep her away from Lindsay.
"Samantha changed the locks on her house. Lindsay moved her stuff out as much as she could. She's basically totally out of the house as far as her stuff and she's not living there anymore. Lindsay was pretty devastated."
Another source added: "Lindsay is going to try and twist the situation in her favour, but Samantha clearly left her, not the other way around."
Lindsay confirmed the split yesterday, saying: "We are taking a brief break so I can focus on myself."
Lindsay's mother Dina has flown to Los Angeles to help her daughter recover from the break-up.
However, Dina's attempt to cheer Lindsay up with a shopping trip did not go as planned - the pair were driving to Malibu on April 5 when Dina was stopped by police for speeding, after doing 65mph in a 35mph zone.
A friend said: "Lindsay is beside herself since the split. She has told family and friends she does not want to be left alone, so her mother came out with her for some retail therapy but it ended in disaster."
Lindsay was later seen crying and talking on her cell phone outside a fast food restaurant.
(China Daily/Agencies, April 8, 2009)
