Every now again, I interact with youth pastors on an issue that doesn't seem to get resolved. Simply put, it goes like this: should we abandon youth ministry in favour of inter-generational ministry? Or, at other times: should we abandon inter-generational ministry in favour of youth ministry? It's one that goes around one - as long as you're looking for a binary answer (i.e. "yes" or "no").
The truth is that there are at least two keys to solving this one once and for all. Firstly, we need to change our mindset about "models of church". Sure, we should have a model for church, but we should have a mindset that says these models are always fluid, always up for change, always morphing, growing, evolving... whatever verb you're most comfortable with. So, at some stages in your church's lifecycle, there might be a stronger emphasis on family ministry. But, then at another stage, later, there might be a focus on youth ministry. It should ebb and flow.
The second key to resolving this is to realise that church mimics the family (its one of the strongest analogies used in the New Testament, afterall). And in a family, there are some activities that are done together, and some that are done separately. This is true in the church. We need to have both family and youth ministries - some activities together and others apart. Some based on age and lifestage, and some based on our shared identity in Christ.
For some further in depth discussions on this topic, see a great blog post here.
For one of the best new books on youth ministry, check out Andrew Root's "Relationships Unfiltered" (buy at Amazon.co.uk) - and see a review of the book here. For the most amazing set of youth ministry resources, check out my good friend, Mark Tittley's Youth Ministry resourcer website.