THE RISE OF Congressman Joe Crowley, D-N.Y., has coincided with lucrative lobbying contracts for his younger brother, John Crowley, an attorney who goes by the first name Sean, and previously specialized in wills and estate law.

Sean Crowley serves as a partner at Davidoff Hutcher & Citron LLP, a powerhouse law firm with offices in Albany, New York City, and Washington, D.C., that advertises its ability to connect clients with congressional leadership.

Over the last decade, clients with interests before Congress have retained Sean Crowley through his lobbying firm, paying more than $4.5 million to influence and monitor government policies, according to a review of contracts by The Intercept.

Clients in recent years have included Oracle, AbbVie, NBCUniversal, Juniper Systems, New York Community Bancorp, Abbott Labs, and Elections Systems & Software.

In many cases, the interests of Sean Crowley’s clients have overlapped with his elder brother’s legislative and political work.

In 2015, Joe Crowley voted in favor of legislation to nullify a rule established by the Consumer Financial Protection Bureau designed to prevent racial discrimination in the auto loan industry.

The legislation was heavily promoted by the National Automobile Dealers Association, the New York affiliate of which retains Sean Crowley as a lobbyist on regulatory issues, including city rules meant to curb predatory lending practices.

In 2013, Joe Crowley helped award $10 million in federal assistance to the Hunts Point Terminal Produce Cooperative, a merchants association in the Bronx that retained Sean Crowley as a lobbyist.

In 2009, both Crowley brothers worked to assist the life insurance settlement industry. A few months after President Barack Obama’s inauguration, Joe Crowley, newly empowered with his first major leadership post at the Democratic Congressional Campaign Committee and a perch on the powerful committee dealing with tax legislation, traveled to Orlando, Florida, to address hundreds of financial representatives.

Joe Crowley, speaking to the Life Insurance Settlement Association’s annual meeting, reassured executives, and noted that Obama had made no mention of life insurance or life insurance settlements during his recent speech outlining his tax agenda, suggesting the audience might be spared from any future tax hikes.

“I think for your industry, that is a good thing,” said Crowley. “It doesn’t mean that you’re out of the woods, but it’s a good thing.”

The congressman encouraged the attendees to contact Democratic lawmakers on the Ways and Means Committee and continue to lobby to share their views.

The friendly chat coincided with a lucrative contract for Crowley’s younger brother, Sean, who was retained by the Life Insurance Settlement Association earlier that year to influence tax legislation on Capitol Hill. Sean Crowley’s lobbying firm, Davidoff Hutcher & Citron, went on to collect $140,000 on behalf of the life insurance settlement client.

The engagement with the life insurance settlement lobby also provided a lift to Joe Crowley. He was the largest recipient of Life Insurance Settlement Association political action committee donations during the 2010 election cycle.

Despite overlapping interests, officials on behalf of both brothers strongly deny that Sean has ever lobbied his elder brother.