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

Reiss family, Attack on Titan Wiki

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

Why was Frieda Reiss so weak? She was killed by Grisha, who barely has experience using his Titan powers. - Quora

Checkmate ending defenders,if carlas death was the reason why grisha gave eren the titan,then zeke should assume that in this moment (read both pages) : r/titanfolk

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In Attack on Titan, why did Grisha kill all Reiss family memebers, after all he needed only Frieda's Founding titan? - Quora

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

Attack On Titan: The 5 Worst Things Grisha Ever Did (& 5 Best)

Why was Reiss family in attack of titan doing many things that were in favor of Marley, even though that may lead them to lose their power, is it really because of

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

Why Did Grisha Yeager Kill The Reiss Family In Attack On Titan? - Animehunch