1) nodesep with pstricks and pst-tree has no equivalent with tikz.This is a problem with Tikz you need to give the sibling distance by hand and not the distance between two nodes. It's possible to create the tree with TikZ with the result of pstricks but it's not easy.
With Pstricks:
http://pascal.parois.net/public/test2.tex
http://pascal.parois.net/public/test2.pdf
With TikZ
\documentclass[10pt]{article}\usepackage[utf8]{inputenc}\usepackage{fourier}\usepackage{tikz}\usepackage[a1paper,landscape]{geometry}\usetikzlibrary{trees,arrows}\pagestyle{empty}\usetikzlibrary{shapes.multipart}\usepackage[active,pdftex,tightpage]{preview}\PreviewEnvironment[]{tikzpicture}\begin{document}\newcommand{\spnode}[3]{%node[rectangle split,rectangle split parts=3]%,rectangle split draw splits=false{\textbf{#1} \nodepart{second} #2 \nodepart{third} \emph{#3}}} \begin{center} \begin{tikzpicture}[% text width = 8em, text centered, level distance = 9em, every node/.style = {rectangle, rounded corners, shade, top color=white, bottom color=blue!50!black!20, draw=blue!40!black!60, very thick, outer sep =2pt, every third node part/.style={font=\footnotesize}}]\tikzset{upstyle/.style={% grow=up,<-,,>=open triangle 60, level 1/.style={sibling distance=60em}, level 2/.style={sibling distance=11em}}}\tikzset{upstyleleft/.style={% level 2/.style={sibling distance=65em}, level 3/.style={sibling distance=60em}, level 4/.style={sibling distance=30em}, level 5/.style={sibling distance=20em}, level 6/.style={sibling distance=10em}}}\tikzset{upstyleleftright/.style={% level 3/.style={sibling distance=10em}, level 4/.style={sibling distance=10em}}}\path \spnode { PAROIS}{Pascal}{date}[upstyle] child {\spnode {HAMEL}{Brigitte}{date} child {\spnode {GUIGARD}{Odette}{date}} child {\spnode { HAMEL}{Jean}{date} child {\spnode { TORQUEO}{Reine}{date}} child {\spnode { HAMEL}{Henri}{date} child {\spnode { THOMAS}{Marie}{date}} child {\spnode { HAMEL}{Paul}{date} child {\spnode { CHANTEUR}{Marie}{date}} child {\spnode { HAMEL}{Emile}{date} child {\spnode { HAUVILLE}{Marie}{date}} child {\spnode { HAMEL}{Ulysse}{date}}}} } } } child[upstyleleft] { \spnode{ PAROIS}{Guy}{date} child[upstyleleftright] {\spnode { COLLANGE}{Odette}{date} child {\spnode {OLLIER}{Marie }{date}} child {\spnode { COLLANGE}{Claudius}{date} child {\spnode { GIMBERT}{Philomène}{date}} child {\spnode { COLLANGE}{Jean}{date}} } } child[upstyleleft] {\spnode { PAROIS}{Alexandre}{date} child {\spnode { BEZIEAU}{Marie}{date} child {\spnode { LEAUTE}{Marie}{date} child {\spnode { CHEVALIER}{Rosalie}{date}} child {\spnode { LEAUTE}{Pierre}{date}} } child {\spnode { BEZIEAU}{Jean}{date} child {\spnode { GENDRON}{Marie}{date}} child {\spnode { BEZIEAU}{Jean}{date}} } } child {\spnode { PAROIS}{Alphonse}{date} child {\spnode { LEBRETON}{Marie}{date} child[sibling distance=10em] {\spnode { RENAUD}{Marie}{date} child {\spnode { EGRON}{Angélique}{date}} child {\spnode { RENAUD}{Pierre}{date}} } child {\spnode { LEBRETON}{Jean}{date}} } child {\spnode { PAROIS}{Auguste}{date} child {\spnode { DOUILLARD}{Adèle}{date} child {\spnode { BONNET}{Marianne}{date}} child {\spnode { DOUILLARD}{Louis}{date}}} child {\spnode { PAROIS}{Jean}{date} child {\spnode{ DUGUY }{Marie}{date}} child {\spnode{ PAROIS}{Pierre}{date}} } } } }}; \end{tikzpicture}\end{center}\end{document}
2) Another thing is about Bezier's curves and the control points, there is nothing automatic with Tikz