ISTANBUL — President Recep Tayyip Erdogan marked the launch of Turkey’s “Year of the Family” on Monday with an attack on the LGBTQ community and the announcement of measures to boost birth rates.

Citing the “historical truth that a strong family paves the way for a strong state,” Erdogan unveiled a series of financial measures to support young families.

The president returned to themes he has espoused before about LGBTQ people, including the portrayal of the LGBTQ movement as part…