Prevent page breaks?

[Hap]

I have a member directory that works fine except the format the customer wants printed. Basically they want the following:

Family Name

FirstName1 Data

MoreData

FirstName2 Data

MoreData

Family Name 2

etc...

Right now I a sub-summary based on the Family name. Works great, except that sometimes a set starts near the bottom of one page and flows to the next. Customer does not like as the Family Name gets separated from some of the members. Tried using a relationship and a portal, unfortunately the individual portal rows will not shrink based on content. Leaves a lot of white space. Again, customer does not like. Any other ideas about preventing subsummaries from breaking across pages?

Thanks...