family tree

Across

1. Passing down a legacy, or a relay racer's primary job?
4. Casual collective for the people who raised you?
6. The generation that lets you spoil them and send them back?
8. Better half who wasn't originally on the family tree?
9. Like a first cousin once removed, chronologically speaking?
10. What a family tree chart looks like upside down?
12. What a family tree does when a new generation arrives?
13. Like spirits that are perfectly aligned?
15. Something common to both a tree trunk and a family ledger?
19. Shared physical features, or what you might pull when mocking someone?
21. The legal right to the kingdom?
24. The patriarchal side of the coin?
26. Palindromic family head?
28. Fraternal short form?
29. Person who kept the line going, biologically speaking?
31. It holds the family roots?
33. A dynasty, like Lancaster or Windsor?
35. The very first branch of a family tree?
37. Distant relative of a horse?
39. The undisputed leader of the family clan?
40. Leaves the family tree, in a way?
41. The grand prize left behind when the family tree loses a leaf?
42. It's thicker than water, or so they say?
44. They may be second or third, but they still feel like first-rate company?
46. Kinship status that sounds like an accurate account?
48. To officially graft a new branch onto the tree?
49. Event where one might say "Look what the cat dragged in!" with affection?
50. DNA source that can follow "sugar" or "founding"?
53. Like the side of the family you don't share a last name with, perhaps?
57. A family tree with paperwork, often for a prized pup?
59. Like a house passed down through five generations, perhaps?
60. Legal recipient of an estate who might be left waiting?
62. Traits passed down that you can't exchange at a department store?
63. Closely related, biologically?
64. Relatives by marriage who often get an unfair rap?
65. To look exactly like an ancestor, with "after"?
66. Kin's traditional alliterative companion?

Down

2. Chosen to be in the tree, making it much stronger?
3. Lineage line that doesn't intersect?
5. Family event marked by a highly collective "Cheese!"?
6. Step in the right direction, historically?
7. What gets tied at the start of a new branch?
11. The newest, loudest bud on the family branch?
14. Double helix that charts your history?
16. A rival for the bathroom mirror, biologically speaking?
17. A double delivery?
18. Ancestral history, briefly?
20. Gone on, leaving memories behind?
22. Labels shared at the top of the mailbox?
23. People who came before you (and might still look over your shoulder)?
25. The person who gets the front seat by default seniority?
27. What the head of the table sits on?
30. Multi-generational hand-me-down?
32. Group of descendants that sounds like a product launch?
34. A massive family gathering that might require renting a stadium?
36. A descendant or shoot, or an ending to a holy city?
38. Where family roots are permanently anchored?
40. Shorthand for a sisterly confidante?
42. A specific generational cohort known for explosions?
43. Type of tree that represents a single, unbroken family lineage?
44. What a dad turns into during Little League season?
45. The ultimate hand-me-down given at birth?
47. A direct descent pattern, or what you shouldn't cross?
51. The molecular software of life?
52. A dead giveaway?
54. A massive extended family, or a survivor's alliance?
55. Total sum of a person's heritage?
56. Like smoothies, or modern family structures coming together?
58. Relative who might legally split the difference?
61. Title for a beloved family elder that sounds rather grand?
62. Unit of inheritance that sounds like a denim trouser?
65. The smallest branch of the family tree?