Trauma of any kind is very serious. This can be self-inflicted or inflicted. Both should be treated with extremely good therapists who specialize in trauma informed therapy. EMDR Certification is a key beginning when searching for a therapist and they should have many years of full-time practice as well.
There are therapeutic providers who only focus on blended family needs. [See referral process] [dealing with divorce], [balance relationships]
Lifestyle examples are powerful. Consider exercising, turning off the news, stop social media, go on a drive vs home with TV.