Relatives of mine have been tracing my family tree one for each side of family.
You need to know your mum and if she could handle any unexpected discoveries?
They’ve discovered illegitimate children that are half siblings to other relatives and basically are evidence of affairs, we’ve also discovered very sad stories of relatives who were mentally ill or learning disabled and were institutionalised including a sibling to one relative that they never even knew existed (several years older than them, never spoken of or visited)
This information has caused some distress to some relatives.
These companies have been running for a bit longer elsewhere and there are even groups in America for people who’ve discovered as a result of these “fun” kits that their ‘father’ isn’t or that a sibling has different parents or that their parents have children elsewhere which are the products of affairs...
There’s even been stories of people being distressed to discover their heritage isn’t what they thought it was, which challenges their perceived identity and can make them question all sorts
There’s even been cases where a relative has tested dna, law enforcement has accessed records and discovered a familial match to awful crimes
IMO its a real Pandora’s box there’s no telling what will spill out
As for the storage of the dna, dna can be planted at crime scenes, the law at the moment may not allow insurance companies and law enforcement to access the data but laws can be changed and once they have the data it’s incredibly difficult if not impossible to “take it back”