PDF software will print whatever is on screen to PDF format, exactly what appears on a single computer screen. So, if you have a family tree on your screen, printing that to PDF format will do so exactly as it appears on your screen.
You could buy the very expensive Adobe Acrobat software package in which there is a PDF printer segment.
You could also download a free PDF printer software off the net. There are several such free software downloads available, just one of which is called “Bullzip PDF Printer.” Once installed, that program makes use of your browser menu “print” command, and if set up to do the printing in PDF format to your storage hard drive or stick, you will get a PDF file that will open in Acrobat Reader and can be even emailed as PDF. It also will print to paper – to print the PDF to hard drive, your control panel printer setting must be set with the PDF Printer selected as your computer’s printer. To then print that result to paper, or to print an opened PDF document to paper, your control panel printer setting must be then your paper-printer.
Easy as pie.