Lifeline options for fathers and children in the inter-revision period. Notes: R-1, previous revision; R, current revision. Lifelines of fathers: 1 – recorded in the previous revision, but left before the current one; 2 – recorded in both the previous and the current revision; 3 – not recorded in the previous revision, but recorded in the current one; 4 – not recorded neither in the previous, nor in the current revision (for these people the skazki register date of arrival and departure, but there are no data on age). Lifelines of children: 5, 6 – born after the previous revision and survived until the beginning of the current one; 7 – born after the previous revision and not survived until the beginning of the current one.