There can be no right to know the identities of your biological or genetic parents. At least not one which is enforceable
What would/will happen if people who have doubts about their parentage claim the same right as those who are adopted or conceived through IVF with donor gametes?
The logical conclusion would be for everybody to have the right, at the age of 18, to demand DNA tests to establish whether the people who are their 'social' parents do really hold that genetic role
Links: Which twin is the father?
Shame and Scandal in the Family
Identity is a link