which spouse of archduke rainer joseph of austria a mother named princess maria christina of saxony ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_parent dbr_Princess_Maria_Christina_of_Saxony_ attr_open 1770–1851 attr_close sep_dot var_uri dbo_spouse dbr_Archduke_Rainer_Joseph_of_Austria brack_close