Option (1) is incorrect: Wife who has her own source of income cannot claim maintenance under Section 125 of the CrPC.
Option (2) is correct: Under Section 125(1)(b), a legitimate or illegitimate minor child, whether married or not, and unable to maintain himself/herself, can claim maintenance.
Option (3) is incorrect: Stepson or daughter cannot claim maintenance under Section 125 of the CrPC.
Option (4) is incorrect: Brother and sister cannot claim maintenance under Section 125 of the CrPC.