Emanuel Frankl - relatives of Emanuel and Theresia Frankl

Greta Franklová, b. 6/8/1905, Transport Cn - 1/23/1943 Uherský Brod - Ghetto Theresienstadt, Transport Cs - 1/26/1943 Ghetto Theresienstadt - KZ Auschwitz.
Arnošt Frankl, son of Max Frankl and of Henrietta Spiegelová, b. 1/12/1922 Praha, Transport Bd - 9/4/1942 Praha - Ghetto Theresienstadt, Transport Eb 5/18/1944 Ghetto Theresienstadt - KZ Auschwitz.
Petr Frankl, b. 11/8/1926, Transport AAl - 7/2/1942 Praha - Ghetto Theresienstadt, Transport Be - 9/1/1942 Ghetto Theresienstadt - Raasika.

While the indicated people may be related, there is no clear connection to the Emanuel and Theresia family tree.

Max was Emanuel's son but did not marry Henrietta. Therefore the holocaust Arnost suggested must be from different parents.
I dont see how this greta suggested is connected to Emanuel's tree.
I dont see how this Patr that was suggested is connected to Emanuel's tree.

I found Greta:
Grete Garai

Good find. Who may be Petr and Arnost?