Friend connection

[SunsetRunner]

My sister and mother have the fitbit Alta just like I do, it doesn't even show them in my friends list as contacts. How do I connect to them?

[mirthdefect]

Have you tried adding them through https://www.fitbit.com/friends?

If you're using the app, there is a known issue with finding friends through facebook (see here), but through the dashboard you should be able to at the least invite them to be friends by email.

[MarreFitbit]

Thanks for stopping by @SunsetRunner, hope you're doing great today ! 

You can add a maximum of 2,000 friends either from the fitbit.com dashboard or from the Fitbit app. You can choose to add friends by one of the following methods:

• Contacts—See your contacts who have Fitbit accounts and those who don't. Invite anyone to be a Fitbit friend. The Fitbit apps for Windows 8.1 and Windows 10 also show you friends of friends. Friends of friends appear only if your friends do no privatize their friends list. (Not available on the fitbit.com dashboard)
• Facebook—If you choose to connect with Facebook, see your friends who also have Fitbit accounts linked to Facebook. Invite anyone to be a Fitbit friend.  You can later revoke access to Facebook from your Fitbit account by changing your settings on your fitbit.com dashboard, or through the settings on your mobile device. If you have more than one Facebook account, you can only link one to your Fitbit account. ​
• Email—Type in the email address of anyone to want to invite to Fitbit.

Follow these steps in order to add them:

1. From the Fitbit app dashboard, tap the menu icon in the top left corner.
2. Tap Friends.
3. If you're using Android Marshmallow, make sure you grant the Fitbit app access to the requested features of your mobile device. For more information, see Why do I receive access requests from the Fitbit app on my Android mobile device?
4. Tap the add button (a pink + sign).
5. Choose the method with which you want to connect to your friends and follow the onscreen instructions.

You can accept or reject friend requests either from the fitbit.com dashboard or from the Fitbit app. For instructions on how to respond to a friend request, do the following:

1. From the Fitbit app dashboard, tap the menu icon in the top left corner.
2. Tap Friends.
3. Tap Messages, if necessary.
4. Tap the person's profile to accept or ignore the request.

Hope this helps!