Zikr & Dua

Changing one's intention of conveying reward after completing the action

Q:

1. I have started reading zikr for my family. I read 100 000 first kalimah for each family member. Is this acceptable and can I change my intention to say that I am reading this zikr for that particular family member and also for every single Muslim from the Hazrat Adam Alaihis Salaam to the last Muslim to to live on earth?

2. Also, is there any related advice that you can give me?