DIL (Daughter in Law) has NO forced share in estate/property of FIL, MIL , Sister in Law, Brother in law.
The money spent on renovation etc can be amicably settled between legal heirs.
The money given to relatives is personal matter and may be settled amicably preferably.
Son, daughters are liable to maintain Mother. She can claim maintenance from sons, daughters, relatives……….
GO thru:
Maintenance and Welfare of Senior Citizens (MWPSC) Act, 2007
https://socialjustice.nic.in/writereaddata/UploadFile/Annexure-X635996104030434742.pdf
and rules framed under the Act in your state ;
https://sjsa.maharashtra.gov.in/en/acts-rules
https://sjsa.maharashtra.gov.in/sites/default/files/em-acts-rules-2010.pdf
https://silverinnings.blogspot.in/2016/07/update-on-various-state-rules-of.html