When normal people love someone I don't think they are as prone to attach all the conditions we might as co-dependents. (Of course we don’t actually state them)
We are prone to give love as a payment in advance almost for some need we have. If we don't get that need met we feel slighted.
It is getting away from this type of ‘conditional’ love that is talked about in Al-Anon.
I don’t think true love can have conditions. It is a feeling which is felt and will cease to be felt under certain circumstances. Conditions are not a normal accompaniment to love.
In response to Cyranoak’s comment that you can't love someone into recovery or sobriety, probably true, but it is likely that if they still feel their family love still them for what they are inside they may find more motivation along the hard road of recovery, once started.
Just IMHO