When using the LOS and families obstacles are ignored.
I have made an example where there is a player unit and an enemy and a green box working as obstacle with a solid behaviour.
When I use the LOS that is added to the player unit it self, it works fine.
Using the one that is added to the family which uses the exact same settings. It doesn't see the green box as an obstacle.
Description of Capx
Check line of sight between 2 objects, using a LOS added to a specific object and one add to a family.
LOS doesn't work when its a family.
That it would be like any other behaviour that is added to a family and can be used by the children.
Operating System and Service Pack
Construct 2 Version ID