In Attack on Titan, why did Grisha kill all Reiss family memebers

Was Zeke Targeted by Tom Ksaver to Inherit the Beast Titan? – In Asian Spaces

Jaeger family (Anime), Attack on Titan Wiki

Eren Manipulates Grisha to Survive – Attack on Titan S4 Ep 20 Review – In Asian Spaces

Attack On Titan: Grisha's 10 Biggest Failures

so why did grisha give eren the attack and founding titans…?? : r/titanfolk

Why did Grisha Yaeger scream out 'Is this what you want Eren' after killing the Reiss family? Was Eren controlling him? If so, how and why? - Quora

In AoT the Reiss said that only royal family can use the Founding Titan. But Eren already managed to control lesser titans and experienced the past about his father's death. Does that

eren yeager – RABUJOI – An Anime Blog

Actually Grisha was the one who ended last Yeager family members. Mf really helped Alliance to kill his last 2 sons. : r/titanfolk

Frieda Reiss, My Little Pony w/ Reiner and Bertholdt Wiki