I could have written your post word for word. I'm my parent's only child and 15 months ago we had a baby after IVF. Following parental statements my whole life about how 'important' family is, there's no sign of my parents. They have yet to meet their 1 and only grandchild. There will never be another, a biological certainty. They live 350 miles away yes, but dad plays golf 5 times a week, drives hundreds of miles a month to tournaments and can't 'let people down' (mum tells me this a lot) at the club.
We've discussed meeting half way, but it's come to nothing as dad is busy, both of them won't get on a train, and so on. Mum won't do anything without him and frankly he can't be bothered. He views the journey as either a duty or a hassle.
Today, I've given up. They asked for videos before xmas to show to their friends at the golf club, wrote cards to their friends with references about all the toys their only grandchild has (pretending they've met the child). They are physically nowhere. No interest, no care, nothing. All they've seen of the now toddler are my WhatsApp videos with toys presumably in the background.
I've stopped caring. They both retired aged 50, 20+ years ago. It's been golf since then. Thousands, maybe 4000 rounds detailed in a diary... That's it. A nice life. But no family left who genuinely care about them now... Either dead, hundreds of miles away or estranged. Sad.
I was deeply embarrassed to begin with and made excuses to my partners parents why they hadn't met the baby. I mentioned health, busyness, bad weather (we had a hot, dry summer last year), other family issues and so on (often fictionalised). I lied. It started sounding idiotic really after a while. Now I just tell the truth: they aren't bothered. They say they are, but they really aren't.
My partner and I laugh at times now... My Mil enquired if she could buy my parents some travel tickets so they could 'afford' to visit (it was her last justification as to why they hadn't visited... Poverty!).. I told her dad bought a brand new car last Autumn :).. That ended that last thought process from my mil.
Remember, you aren't alone.