samrestrain.jpgthe couple on March 27

SamRo's mother and sister have requested information about getting a restraining order against Sam's ex, Lindsay Lohan, X17online has confirmed with the Beverly Hills Police Department.

Even a week and a half ago, the couple were showing signs of strain when we caught them returning to Samantha's house at 3 am after a night at the club.

The relationship has been tumultuous with a signs of a big breakdown on the horizon last month when Sam ran off to Vegas without Lindsay for one of her gigs. Lilo followed her out there and a huge fight ensued ...

Then, three days later, a warrant was issued for Lindsay's arrest because she drove herself home from Vegas after the big blowout.

The very next day on March 14, police were called to Samantha's house after the couple fought and SOMEONE threw something through a window!

On March 19, X17online reported exclusively that the couple was fighting again, inside Sam's Hollywood Hills home late at night ...

Just five days later - another blowout - this time about an alleged infidelity.

On March 27, X17online reported XCLUSIVELY that sources were abuzz with breakup news, saying Lindsay was "so over" Sam.

Then last Saturday seemed to be the last straw ... Sam had Lindsay banned from her sister Charlotte's party at Bar Chateau. Obviously SOMETHING had gone down between Sam and Lilo before the party and perhaps it was then that Charlotte and her mom sought info about a restraining order?

The next day Sam had locksmiths at her house to change the locks to KEEP LINDSAY OUT!

And it seems as if Lindsay and her fam knew something was going down with Sam's fam, 'cause they told us on camera Sunday night to "go follow the Ronsons."

Then news yesterday that Lindsay had confirmed the breakup - as if we need official confirmation!