The family events you mentioned are run three times a week and all are welcome! There are no level caps and you can bring whichever character you are comfortable with.
It is however advisable that you bring a character with reasonable survivability and it would be appreciated if the setup you will be running could be helpful to the group in some way (i.e. healing, reflects, damage, etc.)
The "Must have waypoints" are for guild missions which are fun (i.e. rush) and can give you guild commendations (for some of the best in game stuff). It is well worth to take the time to go trekking to get the waypoints and we do have groups and events (Map clear, achievement hunters, etc.) you could join up with to make getting the WP easier, or if you prefer you can solo/duo it by using appropriate skills (i.e. stealth) and strategies (swimming)
Tequatl Dragon Hunting requires only 1 or 2 waypoints and are a definite must have even at low levels due to the quantity and quality of loot you can get each day as well as the experience of having more than 60 players taking down a world boss!