You can create a parent table with one record whose sole purpose is to summarize the max record ID# of the child table.
You'd have to make sure every child record has this parent's foreign key field as its relation to the parent.
In the relationships properties for these two tables, set a summary field up in the parent that summarizes the "Maximum" of the field [Record ID#].
This will give you what you're looking for in the way of establishing what the child table's max id# record is, and it will give you a start to build on the summary properties.
Hope this helps,