The relationships are:

DR and NSp

JT and ME

DS and WG

VB and NSo

The damage system works as follows.

Digimons from opposite Families inflicts 50% more damage to each other (for example, DR gives more damage to NSp and vice-versa).

Digimons of the same Families inflicts 50% less damage to each other (for example, a VB does half damage to another VB).

Digimons from different families inflicts normal damage to each other (for example, a DS versus a NSo or a JT versus a DR).