Six members (A, B, C, D, E, and F) of a family decide to have a family photo taken, and are sitting on a bed to be photographed. B is to the right of D, A is between F and C. E is standing/sitting at one of the ends and is second to the left of A. F always wants to stand/sit next to D. Who is third from the left in the photograph?

Let's figure out the positions from left to right (positions 1 to 6):E is at one of the ends and is second to the left of A.This implies E must be at the extreme left end (Position 1). Since E is second to the left of A, A must be at Position 3.
$$\text{E, \_, A, \_, \_, \_}$$
A is between F and C.This means F and C must occupy positions 2 and 4.E is second to the left of A, which matches our layout.F always wants to stand next to D.If F were at position 4, then D would have to be at position 5. Let's see: if F is at position 4, C must be at position 2.Let's check the constraint: B is to the right of D.If F is at 4, C is at 2: $\text{E, C, A, F, D, B}$.Let's check if F is next to D: Yes, F(4) is next to D(5).Let's check all conditions for this layout ($\text{E, C, A, F, D, B}$):B is to the right of D? Yes (D is at 5, B is at 6).A is between F and C? Yes (C is at 2, A is at 3, F is at 4).E is at one of the ends? Yes (Position 1).E is second to the left of A? Yes ($3-1=2$).F is next to D? Yes.This sequence satisfies all conditions perfectly. Let's find who is third from the left:1st from left: E2nd from left: C3rd from left: AThus, A is third from the left in the photograph.