Canadian P.M. who is the son of another Canadian P.M.

JUSTINTRUDEAU

This leader took office in 2015 and is known for his progressive policies as well as his family’s long political legacy in Quebec.

This clue points to Justin Trudeau, who served as Canada's prime minister starting in 2015. The hint about being "the son of another Canadian P.M." refers to his father, Pierre Trudeau, who held the same office from 1968 to 1984 (with a brief interruption). The answer combines his first and last name without a space, which is common in crosswords to fit the grid. No wordplay here—just a straightforward reference to a well-known political family.