Here is what the Daily Mail is reporting:
DailyMail.com has leaned that several of [Tamar's] sisters were on hand when an altercation between the couple took place at their Calabasas, California, home a few months ago, and Tamar's older sister Grammy winner Toni Braxton called the police. When authorities arrived, they took statements from several of the other family members on hand.
"Again, since there were no physical signs of battery, Vince was not arrested," the source revealed. "But these fights are happening more and more."