Namaskar.

In the native’s family, during last rites of grandpa/grandma or any senior family member, was there any disrespect done? Such as, father and his brothers breaking into a fight over property/money during the last rites. OR last rites got interrupted and cremation not complete? Did any type of activity happen that dishonored the departed soul?

First check if something like this has happened. if yes, below is what jatak needs to do:

• Perform tarpan shradh rituals, when moon in Magha nakshatra every month. Preferably every month for at least a year.  Also do this during pitri paksha, specially on Sarva Pitri amavas without fail every year.
•  Also do 12th house donations – donate for construction of a temple or donate sesame/til oil for lighting lamps at any religious place.
• In case jatak is non-hindu, please see the applicable rituals as per their customs.