WASHINGTON — President Biden’s daughter-in-law Hallie is the mysterious “new Biden” family member who got paid Chinese cash in 2017, House Oversight Committee Chairman James Comer revealed exclusively to The Post Thursday. Comer said the payments to first son Hunter Biden’s sister-in-law-turned-former lover were revealed in subpoenaed bank records. The records show Hallie Biden received $35,000 over two transfers in 2017 from Biden family associate John “Rob” Walker after he got $3 million on March 1, 2017, from State Energy HK Limited, a firm affiliated with CEFC China Energy.President Biden, who allegedly was the “big guy” mentioned in communications about...