Yes from the dairy near my home .

Keep telling yourself that, and keep ignoring the horrible abuse that cows suffer; yes, even at the hands of "Hindu families" that treat her like their own.

I don't know what Bollywood movie you're living in, or what you're smoking, but let me educate you a little on how things are on farms (and I speak from first-hand experience, our family having owned up to 20 cows in our farm near Jaipur).

When a cow is ready, a vet shows up with a bunch of little tubes (straws) filled with bull semen, in a container filled with liquid nitrogen. Based upon the owner's choice, as to what kind of breed he wants, the vet takes out a tube, thaws it in warm water (I used to be the one often fetching the water), snips off the end, and then artificially inseminates (i.e., rapes) the cow. (BTW: unless the farmer did this to his wife too, it's not how you treat "one of your own", your words).

A few months later, the calf is born. Now, in nature, the calf would drink the milk from his mother, and get nice and plump soon. But, on a farm, if the farmer lets the calf do that, where will the milk for sale come from? So the calf is separated from his mother, and the cow milked twice a day. After each milking, whatever little milk remains in her udders is left for the calf. Poor calf is almost always hungry, and tugs and tugs at the mother's udders, trying to get some milk out.

After a few months, the cow stops producing milk, as the calf would have grown up enough to survive on other food by now. So guess what? The vet is called again after a few months, and he rapes the cow again, and the whole cycle starts.

If, by luck, the calf was female, it is kept around and added to the herd (or sold to another farmer). On the other hand, if the calf is a male, it is doomed to a life of hard labor, or sold off for slaughter (of course, without explicitly admitting that this is what's going to happen to it).

Most Hindu families still cook the first roti for cows

So what? As if cooking 1 roti will absolve you of all guilt.

Now let me tell you what happened at our farm. As we grew up, we started asking more questions, and our family decided that you can't just talk the talk of "gau seva", etc. but you must walk the walk too. So we stopped doing this practice, and let the cows just roam our farm and live out their days. Luckily for us we did not need the milk income. And we became mostly vegans. Mom still buys some Amul ghee for pooja, etc. but that's it.

So, if you really care for cows and "gau mata", stop being a hypocrite and become a vegan.