In a certain code language, ‘FATHER’ is written as ‘ETRHFA’ and ‘GALAXY’ is written as ‘XLYAGA’. How will ‘HABITS’ be written in that language?

Let's trace how letters move positions in FATHER (1 2 3 4 5 6) → ETRHFA:
Letters at odd positions (1, 3, 5): F, T, E

Letters at even positions (2, 4, 6): A, H, R

Notice the arrangement ETRHFA:

It takes the last odd character 'E' (5), then 'T' (3), then 'R' (6), then 'H' (4), then 'F' (1), then 'A' (2).
Alternatively, looking at the pattern via reverse-alternating structural block logic:
The string is rearranged by putting letters at indices 5, 3, 6, 4, 1, 2.

Let's test this with GALAXY (1:G, 2:A, 3:L, 4:A, 5:X, 6:Y):

Pos 5 = X

Pos 3 = L

Pos 6 = Y

Pos 4 = A

Pos 1 = G

Pos 2 = A
Result = XLYAGA. This matches perfectly!

Applying this positions format (5, 3, 6, 4, 1, 2) to HABITS (1:H, 2:A, 3:B, 4:I, 5:T, 6:S):

Pos 5 → T

Pos 3 → B

Pos 6 → S

Pos 4 → I

Pos 1 → H

Pos 2 → A

The final code is TBSIHA.