A division bench of Delhi High Court held as follows,

From Paras 11-13,

11. The daughter-in-law can claim maintenance from her father-in-law provided he has inherited some estate of her husband. The appellant has failed to disclose any estate of her husband having devolved upon the respondents. Not only this, the respondent No.1 father-in-law has already expired. Now only respondent No.2 mother-in-law survives and the appellants cannot as a matter of right, claim any maintenance from her.
12. Section 22 of the Act provides for maintenance of dependents of the deceased by the heirs of the deceased, but this is subject to the condition that they having inherited the estate from the deceased.
13. As already noted above, no estate has been inherited either by the mother or the sister of the deceased husband of the appellant No.1 from which any maintenance can be claimed by the appellants. There is no infirmity in the impugned order of the learned Family Judge. The appeal is hereby dismissed.

Index of judgments under HAMA 1956 are here.