Congrats! Sounds awesome for them and you.
Both my parents and in-laws are in super mess financially at around 60 years old. Not sure how/when/if they will all get retirement figured out.
My parents have got it together; Dad retired from full time work 21 years ago at 56. He sat around for 6 months and then got a two day a week (later three days) that he kept for 8 years. He has also had various casual jobs that recur (eg exam supervisor for university exams) that he can keep doing as long as he wants. His career had compulsory retirement saving from day one. The follow up job had a very generous program that resulted in 17% contributions. They have more in Super (Australian 401k) than when Dad originally retired.
They live relatively simply as that is their preference but do have some high expense areas. Mum is disabled so there are ongoing health care costs and their preferred method of travel is cruising (she can't fly long distances) but they do that once every couple of years or so. Mum was a SAHM for many years and then ran a small business for 11 years when she wound that up money was put in to a retirement account for her.
They are quite open about their finances so I am certain that between their retirement savings and a paid off house they are sitting on around $1.2m plus they have about $50k in directly owned shares. Allowing for drawdown of funds as they age along with the high potential for high dependent long term care for Mum (disability plus many long lived family members makes this likely) I still think there will about half of this left to pass to myself and two siblings.
The in laws are different; FIL is 61 MIL 59. I am guessing that he only started accruing retirement savings when it became compulsory is Australia (1992) so he will work 65 if not beyond not because he wants to but because he needs to to bulk up the retirement accounts. MIL does not work but previously had a small business, when that sold they paid off their house and bought a motorhome large enough that a truck license is required to drive it. They are generally not extravagant but do take a 8-10 week in the motorhome every 12-18 months so this soaks up the cash.
They are not living paycheck to paycheck but do not have much in savings, there was a major IPO recently that they were interested in but didn't have the minimum $2.5k to take it up. I am not aware that they have any investments outside the FIL's retirement savings. As a guess I would say that they have around $800k between paid off house and retirement savings. Once FIL retires from full time work I can't see him doing anything part time. They will, I imagine take longer and more frequent trips, draw down on the retirement savings and and then leave probably half the value of the house ($250k) for my husband and two siblings. Longevity on both sides and their relative youth makes this a distant prospect.
So, neither are a mess but I can see two very different outcomes that will result in two widely different end of life situations and quite disparate inheritances; me around $200k, my husband around $80k.