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This no doubt dates me, but we used to use:

doodly squat, also-doodley squat, also-diddly squat

a minimum amount or degree; the least bit (usually used in the negative):

This coin collection isn't worth doodly-squat in today's market.

to mean the same thing.

According to Random House, it goes back to 1934.

Merriam Webster speculates

perhaps alteration of do one's do to defecate) + squat

Dictionary.com says that:

probably euphemistic variant of doodly-shit, diddlyshit

It was considered "clean" enough for our 1960s era cheerleaders to use in the chant:

Our team is red-hot,

Your team ain't doodly-squat

And your sentence would then be

They don't give parents doodly-squat.

Or

That listserv is only good for doodly-squat.

This no doubt dates me, but we used to use: 

doodly squat, also-doodley squat, also-diddly squat

a minimum amount or degree; the least bit (usually used in the negative):

"This coin collection isn't worth doodly-squat in today's market."

to mean the same thing. According to Random House, it goes back to 1934. 

Merriam Webster speculates that it is:

perhaps an alteration of do one's do (to defecate) + squat

Dictionary.com says that it is: 

probably euphemistic variant of doodly-shit, diddlyshit

It was considered "clean" enough for our 1960s era cheerleaders to use in the chant:

Our team is red-hot,
Your team ain't doodly-squat

And your sentence would then be...

They don't give parents doodly-squat.

Or

That listserv is only good for doodly-squat.

This no doubt dates me, but we used to use:

doodly squat, also-doodley squat, also-diddly squat

a minimum amount or degree; the least bit (usually used in the negative):

This coin collection isn't worth doodly-squat in today's market.

to mean the same thing.

According to Random House, it goes back to 1934.

Merriam Webster speculates

perhaps alteration of do one's do to defecate) + squat

Dictionary.com says that:

probably euphemistic variant of doodly-shit, diddlyshit

It was considered "clean" enough for our 1960s era cheerleaders to use in the chant:

Our team is red-hot,

Your team ain't doodly-squat

And your sentence would then be

They don't give parents doodly-squat.

Or

That listserv is only good for doodly-squat.

This no doubt dates me, but we used to use:

doodly squat, also-doodley squat, also-diddly squat

a minimum amount or degree; the least bit (usually used in the negative):

This coin collection isn't worth doodly-squat in today's market.

to mean the same thing.

According to Random House, it goes back to 1934.

Merriam Webster speculates

perhaps alteration of do one's do to defecate) + squat

Dictionary.com says that:

probably euphemistic variant of doodly-shit, diddlyshit

It was considered "clean" enough for our 1960s era cheerleaders to use in the chant:

Our team is red-hot,

Your team ain't doodly-squat

And your sentence would then be

They don't give parents doodly-squat.

Or

That listserv is only good for doodly-squat.

This no doubt dates me, but we used to use:

doodly squat, also-doodley squat, also-diddly squat

a minimum amount or degree; the least bit (usually used in the negative):

This coin collection isn't worth doodly-squat in today's market.

to mean the same thing.

According to Random House, it goes back to 1934.

Merriam Webster speculates

perhaps alteration of do one's do to defecate) + squat

Dictionary.com says that:

probably euphemistic variant of doodly-shit, diddlyshit

It was considered "clean" enough for our 1960s era cheerleaders to use in the chant:

Our team is red-hot,

Your team ain´t doodly-squat

And your sentence would then be

They don't give parents doodly-squat.

Or

That listserv is only good for doodly-squat.

This no doubt dates me, but we used to use:

doodly squat, also-doodley squat, also-diddly squat

a minimum amount or degree; the least bit (usually used in the negative):

This coin collection isn't worth doodly-squat in today's market.

to mean the same thing.

According to Random House, it goes back to 1934.

Merriam Webster speculates

perhaps alteration of do one's do to defecate) + squat

Dictionary.com says that:

probably euphemistic variant of doodly-shit, diddlyshit

It was considered "clean" enough for our 1960s era cheerleaders to use in the chant:

Our team is red-hot,

Your team ain't doodly-squat

And your sentence would then be

They don't give parents doodly-squat.

Or

That listserv is only good for doodly-squat.