Next Gen characters may be confusing so here are summary lists for them that i have prepared
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Sizzy (Isabelle+Simon) children:
*Ivanka Katelyn Lightwood
*Lucas Robert Lightwood
*George Kyle Lightwood
*(+niece: Cashmia Lewis)

Malec (Magnus+Alec) children:
*Rafael santiago lightwood bane *Max lightwood bane
*Aviana lightwood bane

Clace (Clary+Jace) children:
*Resin Celine Herondale
*Christian Herondale

Dywn (Gywn + Diana) child:
*Jariah Wrayburn- ap Nudd

Jessa (Jem+Tessa) children:
*Wilhelmina (Mina) Carstairs
*William Owen Wei-Lian Carstairs
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(All origin characters and Mina Carstairs belong to Cassandra Clare)

All Next Gen characters belong to Shadowhunting_hub and myself @matillym