How to resize a textFrame, while also resizing its parent (a groupitem)?

I'm trying to find the smallest textframe within a group and then matching that textframe font size to the minimum size allowed for printing. Everything else works, except I can't figure out how to resize the textframe while also resizing its parent, the group.

#target illustrator

docRef = app.activeDocument;

gpRef = docRef.groupItems[0];

var gpHeight = gpRef.height;

//this is the minimum print font size allowed

var minFntSize = 18;

var garbLay;

var txtFrmCount = gpRef.textFrames.length;

var container = { };

var i;

//put each textframe and height prop into json

for(i = 0; i < txtFrmCount; i++) {

    container['prop'+i] = { 'gpTfHeight':gpRef.textFrames[i].height / 72, 'gpTarget':gpRef.textFrames[i] };

}

//find the min value of height prop in textframe; i have the max in there too just incase i need it in the future

var min = Infinity;

var max = -Infinity;

var x;

for (x in container) {

   if( container[x]['gpTfHeight'] < min) {

        min = container[x]['gpTfHeight'];

        minTg = container[x]['gpTarget'];

    }

    if( container[x]['gpTfHeight'] > max) {

        max = container[x]['gpTfHeight'];

    }

}

//duplicate textframe, convert to ouline and get actual height

var txtFrmDup = minTg.duplicate();

txtFrmDup.position = [(minTg.position[0] - 100), (minTg.position[1] - 100)];

txtFrmDup.name = 'garbage';

var tOutline = txtFrmDup.createOutline();

tOutline.name = 'garbage';

var tLogHeight = Math.round(tOutline.height);

garbLay = gpRef.groupItems.getByName('garbage');

//this is the part where I might need to convert to a percentage? tgSize is the target size and I figured I could get the different of the 2 and then use that amount to resize down/up...

var tgSize = minFntSize - tLogHeight;

var perc = Math.round((tgSize/gpRef.height)*100);

$.writeln(minFntSize);

$.writeln(tLogHeight);

$.writeln(tgSize);

$.writeln(perc);

//resize gp so that min textframe font size meets minFntSize

if(tLogHeight < minFntSize) {

    gpRef.resize(perc, perc);

    $.writeln('smaller');

    garbLay.remove();

} else if(tLogHeight > minFntSize) {

    gpRef.resize(perc, perc);

    $.writeln('bigger');

    garbLay.remove();

} else if(tLogHeight == minFntSize) {

    $.writeln('equal');

}

I'm not even sure if I'm going about this the right way. Hoping a fresh set of eyes can take a look and see what I'm doing wrong or not doing? Thanks!