Our project has several working teams as part of our release. Some of
those teams are using a 4 week iteration and some of the teams are
using 2 week iterations. In order to make this work in RTC created a
4 week iteration (iteration 1) and two iterations of two weeks in
length as children of the 4 week iteration (called 1a and 1b). The
Timeline looks like this in the project area

Project timeline
Release 1.0.1
Iteration 1
Iteration 1a
Iteration 2b

Iteration 1a is set as the current iteration, which causes Iteration 1
and Release 1.0.1 to all have the current iteration marker.

In many of the queries, including the built it "Stories in
current sprint" it only shows content that has a target of
Iteration 1a.

Is there a way to both "iteration 1a" and "iteration
1" the "current iteration" so that queries show
content from both?

Our project has several working teams as part of our release. Some of
those teams are using a 4 week iteration and some of the teams are
using 2 week iterations. In order to make this work in RTC created a
4 week iteration (iteration 1) and two iterations of two weeks in
length as children of the 4 week iteration (called 1a and 1b). The
Timeline looks like this in the project area

Project timeline
Release 1.0.1
Iteration 1
Iteration 1a
Iteration 2b

Iteration 1a is set as the current iteration, which causes Iteration 1
and Release 1.0.1 to all have the current iteration marker.

In many of the queries, including the built it "Stories in
current sprint" it only shows content that has a target of
Iteration 1a.

Is there a way to both "iteration 1a" and "iteration
1" the "current iteration" so that queries show
content from both?

There is only one current iteration per timeline.

Queries for the current iteration can either refer to this iteration
alone ('is') or the current iteration and its children ('is part of'),
but there is no option to express 'current iteration and its parent
iteration'.

You could create a query for "iteration is '1' or iteration is '1a'",
but that query would have to be modified whenever the current iteration
changes.