Gadol, looked up what R Twersky is saying:
he suggests either side accomodate if possible, for example, skip gebrochts at a particular meal. Then he calls out sitting at separate table as a problem. Korban Pesach, the first mitzva was to be a family one. “For the family to be separated by a chumrah .. seems to me to be defeating the spirit of Pesach”.
And the story was about 2 Sanz chasidim at Chasam Sofer’s seder. When they came back, Sanzer said that the one who ate gebrochts got Olam Haba, and the frummer one should stand near him in davening while the Rebbe will try to get him forgiveness for trying to be frummer than the gadol hador.