A Boston real estate developer — the brother of a state senator — is facing a number of lawsuits from investors who say he has not delivered on promises of major construction projects in the city.

Andrew Collins, the twin brother of Sen. Nick Collins, D-1st Suffolk, had attracted investors for a series of mixed-use projects in South Boston in an area with rapid growth. Now, he is listed as a defendant in numerous state and federal lawsuits claiming a total of at least $143 million in damages, the Boston Globe first reported.

“Put simply, Collins does not believe that the rules apply to him,” one set of investors wrote in a lawsuit filed in Suffolk Superior Court.

According to the Globe, Collins began collecting properties along Dorchester Avenue over the past several years, eventually c

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