The Philippines, like Panama, has no extradition treaty with the United Kingdom. This is noted in some reporting with implied significance, though whether Darwin chose the Philippines for this reason or for other reasons—the country’s climate, lower cost of living, the presence of a relationship there—is not established.
His relationship with Mark and Anthony after prison has been described, in accounts attributed to people familiar with the family, as divided: one son maintains some contact with him, one has effectively severed the relationship. This outcome—partial, asymmetric, reflecting individual rather than collective choices about what a relationship with such a father can be—seems about as much as the situation permits.
Anne Darwin’s post-prison life has been documented more extensively, partly because she has given interviews, written a book, and established herself in a place and community that is accessible to British journalists. She settled near York. She worked for the RSPCA. She wrote Out of My Depth, her account of the events from her perspective, maintaining throughout her position that she had been coerced into participation. The proceeds she directed to the RNLI and the RSPCA—gestures that can be read as acknowledgments of the harm done, though their symbolic weight depends on how you read her role in the events they were acknowledging.
Her description of her relationships with Mark and Anthony after prison is that she reconciled with both sons and that they have holidayed together. Whether this account is complete, current, or reflects both sons’ perspectives equally is not determinable from available sources.